Grinding-machine.



A. B. LANDIS.

GRINDING MACHINE. urmoumn FILED nov. 27, 1906. RENEWED we. 31, 1909.

Patented Jan. 4, 1910.

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A. B. LANDIS.

GRINDING MACHINE. APPLICATION FILED NOV. 27, 1906. Bnnnwnn 16.31, 1909.

Patented Jan.4, 1910.

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KM T6? A. B. LANDIS. GRINDING MACHINE. APPLICATION FILED NOV. 27, 1906. nnnnwnn we. 31, 1909.

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iTn STATES PATENT onnion;

ABRAHAM B. LANDIS, OF WAYNESBOBO, ZPENNSYLVANIA, ASSIGNQR TO LANDIS TOOL COMPANY, A CORPORATION OF PENNSYLVANIA,-

BIND QN A HI E- Application filed November 27, 1906, Serial No. 845,893.- Renewed August 81, 1909. Serial No. 515,438.

To all whom it may concern:

Be it known that I, ABRAHAM B. Lann e, a citizen of the United States,residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Grind- -Mac i es, of which he following is a pecification My said invention consists in certain improvements in grinding machines whereby such a machine isprovided which is par ticularly adapted for grinding ball-races for bearings where balls are used, and sufc h like cireular grooves, all as will be hereinafter mQle fully described and claimed.

Referring to the accompanyin drawings which are made a part hereof an on which similar reference Characters indicate similar parts, Figure l is a top plan view of a grinding machine embodying my saidinvention, Fig. 2-a transverse vertical section through the same looking in the direction indicated by the arrows from the dotted line 2-2 in Fig. 1, Fig; 3 is a front elevation with a,

portion of the casing broken away to-show the interior arrangement more clearly, and Figs. 4, 5, 6, 7, 8. and9 detail views ill-ustrating details of construction and operation more clearly. a d

In the drawings the portions marked A represent the main frame of the machine, 13 the grinding Wheel carriage, C the slider, D the table carrying the work holdingmechanism, and E the carriage carrying the work holding clutch.

The main frame Aflis a hollow casting of suitable forin to support the several parts and provided with bearings for the several shafts as will be presently described. On one side it is formed with suitable ways a a on which ,the carriage B is mounted and e carriage B is of suitable form to sup:

port the grinding wheel mechanism upon the.

ways a a. on the bed A and is provided on itsunderside with a rack bar 6, with whieh a pinion 1 on a transverse shaft 2 engages. Said shaft 2 is mounted in suitable hearings in the bed A and has a hand wheel 3, on its outer end by h ch t m y b turned o traverse the carriage back and forth n on the bed A to bring the grind ng whee. to

the desired positions.

Th der is mou d i t e alpr any appro e manne upon a raver e s ide base C secured to its forward end in which bearings are provided for the spindle c of the grinding Wheel a. A driving shaft 4 is mounted in suitable hearings on the top of the slider C and provided wit a belt pulley 5 by which it may be geared to any suitable power shaft. Said shaft 4: is also provided with another pulley 6 connected b a belt 7 with a pulley 8 on the grinding w eel s ,in die 0, for driving said grinding" Wheele mechanism for moving said slider back and forth on the slide B'to carry the grinding he l t n from the .work i op rate y he hand Wheel and y be imilar to ha shown n ev al of my former pate ts, such as shown in Figsf3 and 4 of Patent 0,699, for exampl and s not par c la y illustrated herein,- being well understood by those familiar with the. art.

The work suppo ting able D is mounted tigidl upon the t p end of a verti al shaf 10, w ieh is journaled in suitable bearings and A rig dly'conne t t e bed r rame A Sa d able D extend to one side of the axis of said shaft 10 and has a slide D adjn tably. mounted thereon by means of a screw (1 which is held in a bracket (1 on the side of said part D and engages a re -threaded perfor tion in par 'Th top of s id pa t has ransverse way n which e ar a -E is m unted The wer nd f s a 0 a c nk-arm D igidly cure hereto and nn cted. by a itman 1 with a cran -arm on the top of a haf 13, w ich is journaled in bea ngs A nd on he opposite si of the d A A gear wheel 14; ijs'mounted on the lower end of said shaf 13 wh h i ap d o me h with a gear 15 on ashaftv 16 wh ch s mount: ed n su ta le be r ng c a d a in o .p si s de of the bed A and s cone Pu l the b e .1) and may e he d in dj sted Pos tion by m ans of an verse set-scr ws ga n t one s def the way on a slid Patented Jan. 4, 1910.

ey on its ou er QndbyWhich i ma be geared. by a bel (not sho n) o uita a drivi g 18 mounte near the to the fr me ha ngscr w e he d 111 a br cket on heend of A B' provided on the carriage B and has a i The, work holdin c rriage E is mounted moun e 11 sore =thr ad d perforat ns in" one of the flanges and adapt d o lmp ne carriage E engages with a nut carried by slide D and thus serves as a means for adjusting said carriage back and forth.

The work-holding chuck E is or may be of any suitable or approved form for holding the character of work for which the machine is intended and is mounted upon a shaft E in suitable bearings E provided on the carriage E. A belt pulley E is provided on shaft E adjacent to said chuck by which it may be driven by a belt gear from any suitable power In Figs. 7, 8 and 9 I have illustrated different forms of work which this machine is intended to do. In Fig. 8 the grinding wheel 0 is shown as operating in an annular groove in the face of a plate w. The parts of the machine adjusted as shown by whole lines in Fig. 1 are in the position-required to do this particular work. In Fig. 7 I

show the grinding wheel 0 as operating in a I groove in the inside edge of a ring to. The

position of the work-holding table for doing this character of work is illustrated by dotted lines in Fig. 1. The work consisting of the ring w being held by the work-holding chuck E, as will be readily understood. In Fig. 9 the grinding wheel 0 is shown as operating in a groove in the circumference of a disk'w The work-holding carriage will be in the same relative adjustment for this work as shown by dotted lines in Fig. 1 except that the carriage E must be adjusted on the slide D to bring the center of the work dir'ectlyover the axis of the shaft 10 carrying the work-holding carriage.

In the operation of the machine the work, whether it be of the form shown in Figs. 7, 8 or 9, is mounted in the work-holding chuck E in the usual and well known manner and the carriage E and work-holding table D are adjusted to bring the center of the circle describing the curve of the groove to be ground directly over the center of the axis of the upright shaft 10 which carries said work-holding table These adjustments are secured by swinging the work holding table D to either the position shown by whole lines or that shown by dotted lines in Fig. 1, according to whether the ball-race or groove isto be ground in the face of the work, as'shown in Fig. 8, or in the edge of the work as shown in Fig. 7 or 9. This adjustment is secured by backing the locking screw d (which is mounted in a screw-threaded perforation in the end of the arm D out of engagement with a notch d two of which are formed at right angles to each other in the sides of the shaft 10 where it extends into said arm D The clamping screw d, which extends through ears on opposite sides'of a slot in one side of the eye in arm D which receives said shaft 10, is also loosened,'which thus permits said shaft 10 to turn freely in said arm D". Said shaft and the table carried upon its upper end is then swung from one position to the other as may be required by the work which is to be done by the machine and the set-screw d is turned to engage with the other one of the notches (Z and the set-screw d is turned up tightly, which thus locks arIn'D rigidly in this position on the lower end of said shaft 10. Said arm D being connected by the pitman 11 to the crank-arm v12 on the shaft 13 and said shaft 13 being driven through the gears 14: and 15 from the driving shaft 16, the upright shaft 10 is given a rocking or vibratory movement as will be readily understood, and the work w 'w' or 'w being held with its center directly above the axis of said shaft 10, is

given a true vibratory movement around the operating face 'of the grinding wheel 0, which bemg at the same time in rapid rotary motion grinds the groove with a face of a true curve in cross section as well as of a true circle in form. The length of the vibratory or rocking movement of shaft 10 may be regulated by adjusting the o crating length of the arm D by means of an adjustable connection with pitman 11 which is most clearly illustrated in Figs. 4 and Said arm D is formed with a slot "(Z in which is mounted a bearing D having an annular flange around its lower end adapted to engage with the lower edge of said arm D and formed screw-threaded-at its upper end and provided with a nut- D having ahandle d by which it may be turned and thus firmly clamp said bearing D in any desired adjustment in said slot (i The pitman 11 is journaled on the lower end of a bolt D mounted in bearing D and having a nut (1 on its lower end between which and a washer said pitman 11 is held and adapted to pivot. Thus by backing the nut d by means of handle d the bearing D is loosened and may he slid back and forth in the slot D to secure the length of throw or sweep of the arm D desired, and when the proper adjustment is secured the parts may be locked in this position by turning said nut by means of said handle to clamp said bearing securely to the top and the lower edges of said arm. The opposite end of pitman 11 is pivoted to the crank-arm 12 in a similar manner as shown most clearly in Fig. 5. The pitman 11 has a sleeve 20 mounted in a perforation therein through which a bolt 21 is inserted, the

lower end of said bolt 21 being screw-thread, .ed and adapted to screw into a screwthreaded perforation in said arm 12. washer 22 is interposed between the face of said arm 12 and the lowerend of said sleeve 20 so that the pitmanll is left free to pivot on said sleeve between said washerv and a shoulder near the upper end thereof. Said crank-arm 12 is secured to the upper end of a shaft 13 by means of a set-screw 23.

It will thus be seen that the throw of the crank-arm D may be accurately "adjusted to suit any conditions or requirements of the work. Y

The grinding wheel 0 when in operative riage B, after bein a usted through the.

medium of the shaft 2 with the pinion 1 thereon engaging with the rack b, may be locked in a proper adjustment by means of a band-brake 26 which is carried on the frame A and encircles a brake-wheel 27 rigidly mounted on said shaft 2. Said brake 26 is operated by a hand lever 28 having a nut on its end which engages with the upper end of a clamping bolt 29 which projects through perforations in the two -adjacent endsof the brake as shown most clearly in in order to provide that the face of the grinding wheel 0 may be kept of a true curve and in condition for doing the work in a most advantageous manner, I have shown a diamonding tool mounted directly upon the machine in position to be readily used at any time for dressing off the face of said.

grinding wheel. Said tool consists of a standard 40 mounted on a base 41 which base is mounted to slide on a transverse'way.

42 on the top of bed A near the end opposite the shaft 10. Said standard is pivoted to the base 41 on a pivot 43 and adapted to] be swiveled thereon by means of a handle 44.- A stud'45 with a diamond on its front end is carried by said standard near its top in position to be opposite the axis of the shaft 0 carrying the grinding whe el o. In

operation the carriage B is run back upon the carriage C is then moved forward by means the ways on the topof.frame A until the arm 25 strikes another stop 46, which is also mounted in the gi'oove near the to of said frame, as is the stop 24, and is ad usted to that position to limit the rearward movement of said carriage B to bring the center of the grinding wheel 0 opposite the axis of pivot 43 of the diamonding tool.- The of'the', hand wheel 30 until the face of the grindih' wheel will contact with the diamond o the tool, which tool is swiveled on its pivot 43 by means of the handle 44 to travel back and forth across the face thereof. Said wheel being in rapid rotation the diamond o erates to removeany imperfec-.

tions and ress off said face'toa true curve very quickly and put it in perfect operative condition and to conform with the circle to be ground as the radius of the swing of the tool may be adjusted to suit. It will thus be seen that thegrinding wheel may be very conveniently kept in order, as at any time during the operation upon any piece of work when its condition becomes unsatisfactory the operatoris enabled to quickly run the carriage B to the stop 45 and by a few vibrations of the diamonding tool across the face of said -wheel correct any irregularity and put it in perfect form. By this means grooves of a true form for ball-races in different kinds of mechanism where such structures are used may be quickly and erfectly formed by grinding, as will be readily understood.

Having thus fully described. my said invention, what I claim as new and desire to secure by Letters Patent, is 1. A grinding machine, for grinding curved surfaces, comprising a frame, the grindin wheel carriage, means for adjustmg sai carriage, the grinding wheel base mounted. thereon, said grinding wheel, means for driving the same, a work su porting table mounted on a pivot or sha means for adjustably holding the work on said table with the axis of the curve of the work in line with the axis of said pivot, and

means for rocking said table' on its pivot, substantially as set forth.

2. In a grinding -machine. the combination of the frame, the grinding wheel carriagemounted thereon, the grinding wheel mounted on a spindle andjou-rnaled in suitable bearings in a base'mounted on said carriage, the work holding table comprising a supporting arm mounted at one end upon a vertical shaft, work holding devices mounted upon itsopposite end, and means. for vibratingor rocking said shaft'to carry the work in a curved path across the face of the grinding wheel, substantially as set forth.

3. In a grinding machine, the combination of the frame, the grinding wheel suitably mounted aridgeared to be driven, a vertical shaft, a work supporting table mounted upon said vertical shaft, adjustable work holding devices mounted on said table,

- means for adjusting andsecuring the work at a point in line with the axis of said vertical shaft, means for adjusting and securing the grinding wheel at a point in line with the axis of said vertical shaft, and.

'means for. automatically rocking sai'd vertical shaft, substantially as set forth.

4.- In a grinding machine, the combination of the frame, the grinding wheel carriage mounted in suitable ways thereon, means for traversing said carriage back and forth,lmeans forlocking said carriage in any adjusted position, a slider mounted on a transverse way on the topof said carriage,

-means for adjusting said slider back and forth, the grinding wheel base on said slider mounted thereon, means for driving said carrying the bearing for the grinding wheel spindle, the grinding wheel spindle mounted in said bearing. the grinding wheel on said spindle, means for driving said spindle, the work supporting table mounted on a vertical shaft, means for clamping the work on said table, and means for rocking said pivot or shaft to carry the work in a curved path across the face of said grinding wheel, substantially as set forth.

5. In a grinding machine, the combination of the frame, the grinding wheel suitably mounted on one side thereof, means for adjusting and driving said grinding wheel, the work supporting table mounted upon the opposite side of the frame on a vertical'shaft, gearing driven from the machine driving shaft for rocking said shaft to swin said table in the arc of a circle around its axis, the work holding devices on said table, and means for adjusting said work holding devices to bring the work in line with the axis of said shaft, substantially as set forth.

6. In a grinding machine, the combination of the frame, the grinding wheel carriage,

. the grindin wheel suitably mounted thereon, means or adjusting the parts carrying said grinding wheel, means for driving said grinding wheel, the work supporting table mounted on a vertical shaft, means for holding the work mounted on said table, means for adjusting the work holding devices to bring the work in line with the axis of said shaft, a crank-arm on the lower end of said shaft, a second vertical shaft on the opposite side of the machine geared to a power shaft and having a crank-arm on its upper end, and a pitman connecting the crank-arm to said second shaft, substantially as set forth.

7. In a grinding machine, the combination of the frame, the grindin wheel suitably mounted thereon, means or driving said grinding ,wheel, the work supporting table mounted on a vertical shaft, means for holding the work adjustably mounted on said table, a crank-arm secured to the lower end of said shaft and provided with means for securing it to said shaft in different positions, and means connected with said crankarm for rocking or vibrating said shaft, substantially as set forth.

8. In a grinding machine, the combination of the frame, the grinding wheel suitably grinding wheel, the work supporting ,table mounted on a vertical shaft, the work holding devices adjustably mounted on said table, means for rocking said shaft, and means for swinging and securing said table to a normal position either to hold the face of the work parallel with the axis of the grinding wheel or at right. angles thereto, substantially as set forth.

9. In a grinding machine, the combination of the frame, the grinding wheel suitably mounted thereon, means for driving said grinding wheel, the work supporting table mounted on a Vertical shaft, a crank-arm secured to the lower end of said shaft by means which may be secured to said shaft in different positions to secure the normal position of the table in different relative positions to the grinding wheel, and means connected therewith for imparting a vibratory motion to said shaft, substantially as set forth.

10. In a grinding machine, the combination of the frame, the grinding wheel suitably mounted thereon, means for driving said grinding wheel, the work supporting table mounted on a vertical shaft, means for holding the work adjustably mounted on said table, a crank-arm secured to the lower end of saidshaft, a pitman one end of which is adjustably secured in a slot in said crankarm and its other end secured to a crankarm mounted on another shaft, and means for driving said other shaft whereby :1 vibratory or rocking movement is imparted to the shaft carrying said work supporting table, substantially as set forth.

11. In a grinding machine, the combination of the frame, the grinding wheel supporting and operating mechanism, the workholding and supporting mechanism mounted on a ivot at right angles to the axis of the grin ing wheel, means for vibrating said pivot, and means for adjusting the length of the vibratory movement, substantially as set forth.

In witness whereof, I, have hereunto set my hand and seal at VVaynesboro, Pennsylvania this 23d day of November, A. D. nineteen hundred and six."

ABRAHAM B. LANDIS. [L.S.] 

